Effect of Gaseous Pollutants (NO 2 , SO 2 and O 3) on Cultural Heritage Materials: A Case of MFAs in Brussels, Belgium. GJSFR [Internet]. 2018 Sep. 7 [cited 2026 Aug. 13];18(A7):29-33. Available from: https://www.journalofscience.org/index.php/GJSFR/article/view/2330